My concern would be if the focal mechanism shows “normal” faulting and it was moderately shallow with a mostly east-west strike plane. That might be an issue. It’s the sort of things that odd seamounts are made of.

… oh, and it would have to be conspicuously large. So large that posting about a quake here would not be the hot news item… it would be the tsunami.

Quoting: Luisport

tsunami is yet to come, my friend, and not one (you remember where the Hawaii? in the Pacific Ocean, and then it's not at all uncommon)

about earthquake: in fact really quite ordinary, it was correctly noted. and we're here mentioned it just casually , right?but with conclusions vc as always clearly in a hurry, see for example here [link to hvo.wr.usgs.gov] sure , tomorrow report of Hawaiian observatory will necessarily contain interesting details

The subglacial Grimsvotn volcano, Iceland, began erupting on 21 May 2011, around 18-19 GMT. The eruption was preceded by intensive earthquake activity lasting for about 1 hour. An ‘ash-loaded’ eruption plume rose rapidly up to about 17 km height (estimated 55000 feet from ground based radar, overview flights, and pilot reports). Ash from the lower part of the eruption plume was deflected southwards and from a higher level towards the east. Few hours after the onset of the eruption ash fall began over wide area in the nearest populated areas south of the Vatnajokull ice cap, at a distance of more than 50 km from the eruption site.

Grimsvotn is a basaltic volcano that has the highest eruption frequency of all volcanoes in Iceland. It is located near the centre of the Vatnajokull ice cap, the largest ice cap in Europe. The volcano has a caldera complex, the most recent one hosting the Grimsvotn subglacial caldera lake that is sustained by extensive geothermal activity. The volcano is almost fully ice covered and interaction of magma and meltwater from the ice causes phreatomagmatic explosive activity.

Initial overview flight, with limited visibility, and earthquakes locations suggest an eruption site in the southwestern part of the Grimsvotn caldera. Ice cover there is relatively thin (50-200 m) and meltwater is anticipated to accumulate within the Grimsvotn caldera lake. From there, it may eventually drain in a sudden glacial outburst flood, jokulhlaup, along a subglacial channel and issue from the Skeidararjokull outlet glacier.

The height of the initial plume in the present eruption, 17 km, is much higher than in a preceding eruption at Grimsvotn in 2004. Then an eruption produced a plume reaching an estimated height of 6-10 km above vent. The present plume is also higher than recorded in the Eyjafjallajokull eruption in Iceland last year.

A GPS-station on the rim of the Gr&#237;msvotn caldera has revealed continuous inflation and expansion of the volcano of few cm per year since the 2004 eruption, interpreted as inflow of magma to a shallow chamber. Another long-term precursor was increase in seismicity over last few months, including some bursts of tremor. Increase in geothermal activity was as well observed in the months leading to the eruption.

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

nice

Boris BehnckeKitchen with a view on a paroxysm: [link to farm9.staticflickr.com] ...No doubt the view is spectacular - and it is so not only from our kitchen but also from our bedroom, and from our daughter Ida's room. Maybe it is still more impressive with the village in the foreground, and its main road, appropriately named Via Etnea (visible in the center), leading right toward the mountain.

[link to www.cenapred.unam.mx] Yesterday was observed a spasmodic tremor event was accompanied by the continuous emission of steam, gas and varying amounts of ash. This event lasted 9 hours, started at 08:58 and ended at 17:06 < (see image), and produced ash fall in San Nicolas de los Ranchos, Huejotzingo and in the northern portion of Puebla. Later, between 18:10 and 20:20 there were several episodes of exhalations trains(see image) that were acompannied by amounts of ash dispersed northeast, mainly. After these events visible activity of the volcano returned to its previous levels. Various exhalations were recorded with a slight explosive component. Some of these exhalations produced the emission of ash and incandescent fragments that were deposited mainly in the northeastern slope, reaching distances up to 700 m. The most important occurred at 20:23 (see image), 20:50 (see image), 23:00 (see image), 23:37 (see image), from yesterday and today at 05:20 h (see image), (see image), , (see image), (see image), (see image), (see image) . Overnight continuous incandecence was observed on the crater increased when major exhalations (see image) . At the time of this report there is a emission of water vapor and gas heading northeast (see image).

[link to www.cenapred.unam.mx] Yesterday was observed a spasmodic tremor event was accompanied by the continuous emission of steam, gas and varying amounts of ash. This event lasted 9 hours, started at 08:58 and ended at 17:06 < (see image), and produced ash fall in San Nicolas de los Ranchos, Huejotzingo and in the northern portion of Puebla. Later, between 18:10 and 20:20 there were several episodes of exhalations trains(see image) that were acompannied by amounts of ash dispersed northeast, mainly. After these events visible activity of the volcano returned to its previous levels. Various exhalations were recorded with a slight explosive component. Some of these exhalations produced the emission of ash and incandescent fragments that were deposited mainly in the northeastern slope, reaching distances up to 700 m. The most important occurred at 20:23 (see image), 20:50 (see image), 23:00 (see image), 23:37 (see image), from yesterday and today at 05:20 h (see image), (see image), , (see image), (see image), (see image), (see image) . Overnight continuous incandecence was observed on the crater increased when major exhalations (see image) . At the time of this report there is a emission of water vapor and gas heading northeast (see image).

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

...

today official report about yesterday activity

[link to www.cenapred.unam.mx] Yesterday was observed a spasmodic tremor event was accompanied by the continuous emission of steam, gas and varying amounts of ash. This event lasted 9 hours, started at 08:58 and ended at 17:06 < (see image), and produced ash fall in San Nicolas de los Ranchos, Huejotzingo and in the northern portion of Puebla. Later, between 18:10 and 20:20 there were several episodes of exhalations trains(see image) that were acompannied by amounts of ash dispersed northeast, mainly. After these events visible activity of the volcano returned to its previous levels. Various exhalations were recorded with a slight explosive component. Some of these exhalations produced the emission of ash and incandescent fragments that were deposited mainly in the northeastern slope, reaching distances up to 700 m. The most important occurred at 20:23 (see image), 20:50 (see image), 23:00 (see image), 23:37 (see image), from yesterday and today at 05:20 h (see image), (see image), , (see image), (see image), (see image), (see image) . Overnight continuous incandecence was observed on the crater increased when major exhalations (see image) . At the time of this report there is a emission of water vapor and gas heading northeast (see image).

Yesterday the monitoring system of Popocatepetl Volcano recorded an episode of tremor, low and medium range, combined with some moderate exhalations of great intensity. This event lasted a total of 3 hours and 10 minutes. It started at 15:50 h. and ended at 19:00 h. Associated with this activity the volcano was observed emitting a thick and continuous column of steam, gas and low ammounts of ash that reached up to 1km above the crater and headed northeast (see image) .

Additionally, at the end of this event, the visible activity of the volcano return to previous levels. 76 exhalations were recorded with a slight explosive component. The most important exhalations occurred yesterday at 21:37 h (see image) , 23:44 (see image) . , and today at 2:09 (see image) and 6:32 (see image) and produced the emission of ash and incandescent fragments that were deposited mainly in the northeast slope and reached distances to 400 m. Some of these exhalations were presented as hereinbefore defined as exhalations train.

During the night there was a persistent glow over the crater increased when major exhalations (see image) . At the time of this report there is a light emission of water vapor and gas heading northeast (see image) .

Jan Mayen [link to www.volcano.si.edu] Volcano Type: Stratovolcano Volcano Status: Historical Last Known Eruption: 1985 Summit Elevation: 2277 m 7,470 feet Latitude: 71.08°N 71°5'0"N Longitude: 8.17°W 8°10'0"W Remote Jan Mayen Island, located in the Norwegian Sea along the Mid-Atlantic Ridge about 650 km NE of Iceland, consists of two volcanic complexes separated by a narrow isthmus. The large Beerenberg basaltic stratovolcano (Nord-Jan) forms the NE end of the 40-km-long island, which is ringed by high cliffs. Beerenberg is a large 2277-m-high glacier-covered stratovolcano with a 1-km-wide summit crater and numerous cinder cones that were erupted along flank fissures. It is composed primarily of basaltic lava flows with minor amounts of tephra. Historical eruptions at Beerenberg date back to the 18th century...

Jan Mayen [link to www.volcano.si.edu] Volcano Type: Stratovolcano Volcano Status: Historical Last Known Eruption: 1985 Summit Elevation: 2277 m 7,470 feet Latitude: 71.08°N 71°5'0"N Longitude: 8.17°W 8°10'0"W Remote Jan Mayen Island, located in the Norwegian Sea along the Mid-Atlantic Ridge about 650 km NE of Iceland, consists of two volcanic complexes separated by a narrow isthmus. The large Beerenberg basaltic stratovolcano (Nord-Jan) forms the NE end of the 40-km-long island, which is ringed by high cliffs. Beerenberg is a large 2277-m-high glacier-covered stratovolcano with a 1-km-wide summit crater and numerous cinder cones that were erupted along flank fissures. It is composed primarily of basaltic lava flows with minor amounts of tephra. Historical eruptions at Beerenberg date back to the 18th century...

[link to volcans.blogs-de-voyage.fr] A Sicilian friend has just told me that from now on, it is advisable, before starting a visit to Mount Etna, to consult the Civil Defence website in order to know the level of danger. Note that the site is in Italian and it is necessary to know this language to understand what is written! [link to www.protezionecivile.gov.it]

[link to volcans.blogs-de-voyage.fr] A Sicilian friend has just told me that from now on, it is advisable, before starting a visit to Mount Etna, to consult the Civil Defence website in order to know the level of danger. Note that the site is in Italian and it is necessary to know this language to understand what is written! [link to www.protezionecivile.gov.it]

Claude GrandpeyKilauea...As I put it before, access to the summit lava lake and to the Pu’uO’o area is not allowed to tourists. While maintaining the measuring instruments, HVO scientists have the opportunity to take some photos that show the evolution of the situation. The latest images are both dramatic and beautiful. They show 1) a helicopter view of Pu’uO’o seen from the eastern part of the crater where the overflow is taking place; 2) a skylight in the Kahauale`a lava flow near the rim of Pu’uO’o; 3) a spatter cone in the northern part of the crater floor.

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

Thanks, my friend! third day i was awaiting when Dr. Boris Behncke say something about this phenomenon (of course he could not miss it)once again we are talking about it, it is appropriate to repeat previously posted here video in which he is very well captured, from 03:28

great! today Etna again showed her famous rings !(more about rings and shots of old cases in Boris Bhncke blog)look 03:28

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

[link to www.wired.com] BY ERIK KLEMETTI 04.16.1312:54 PM... Now Etna has produced these “smoke” rings before, but it is always impressive when it does as they seem so perfectly formed. Other volcanoes have produced them as well, including Eyjafjallajokull during its 2010 activity. Not much is known about exactly how these rings form, but it could be related to brief explosions in a confined vent that allows for that “puff”, which then expands into a ring. Be sure to check out the great video (with sound)from Dr. Boris Behncke from the April 11-12 paroxysm at Etna — definitely a spectacular view of strombolian explosions in the New Southeast Crater.

[link to www.wired.com] Boris Behncke • 4 hours ago &#8722;... and just for the record, we're already seeing renewed activity at Etna's New Southeast Crater (small ash emissions), though this is difficult to note due to clouds over the summit, and the dense gas plume blowing south, where quite a few of the working webcams are located. You may see a bit of the action on the Montagnola thermal camera ...

...Scientists explain that getting a ring requires two initial conditions: smoke and speed at the start. In the case of the volcano, it is the fumaroles and the rising hot air that is emitted by a vent that are likely to generate the rings. But all the jets do not become smoke rings! A smoke ring can only be achieved if the jet is discontinuous. It is formed around a core around which the fluid rotates. Each part of the ring is subject to the induced velocity of the other parties: the right half of the ring rotates clockwise, and the left half in the opposite direction.

Thus, the ring cannot stay still: it is in constant motion relative to the fluid that surrounds it. Thus, a ring does not stand still above Mount Etna; it inexorably moves away...

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

Google translationNews of activity of the Nevado del Ruiz volcano, April 12, 2013, 11:30 (local time)During this day continues to record the seismic signal of volcanic tremor, associated with the movement of fluids within the volcanic conduits and gas and ash emissions, which has been showing low energy levels.In the morning it was observed by the webcams located in the area of the volcano, the plume of steam, gases and ash, with an approximate height of 1600 meters above the summit, heading to the northwest of the volcano presenting white, but with the presence of particulate matter (ash) See animation. There have been several reports from yesterday, officials from the National Natural Park Los Nevados and OVSM, fine ash fall in small amounts in areas surrounding the volcano.Additionally, continued emissions of sulfur dioxide (SO2), evidenced in measurements of equipment installed in the field and through satellite images. [link to www.ingeominas.gov.co]

With regard to the monitoring of the activity of the Nevado del Ruiz volcano, the Volcanological and Seismological Observatory of Manizales, reports that:Continued volcanic tremor logging, seismic signal associated with the movement of fluids within the volcanic conduits and gas and ash emissions, showing low energy levels. From yesterday in the afternoon, this signal has been accompanied by the registration of volcano-tectonic earthquakes, located to the northwest of Arenas crater, at an average depth of 7 km, until the time of issuance of this notice, the largest magnitude earthquake recorded corresponds to at 22:43 (local time) on April 13 with 2.6 ML (local magnitude), felt by officials of Colombia National Parks in the area of Brisas.

During the early morning hours, web cameras installed in the volcano area, allowed to observe a plume of steam, gases and ash, with an approximate height of 630 m measured from the top of the volcano, this column shows white grayish, due to the presence of particulate matter (ash), and is directed towards the northwest along the prevailing wind regime in the area.

Emissions of sulfur dioxide (SO2) are still important as indicated by measurements of field installed equipment and satellite images.

With regard to the monitoring of the activity of the Nevado del Ruiz volcano, the Volcanological and Seismological Observatory of Manizales, reports that:

Below is a summary of the activity of the volcano Nevado del Ruiz filed during the last week including the information of the last hours. It is clarified that despite variations in seismic activity remains Amarillo activity level or III. Changes in the behavior of volcanic activity.

Continued seismic activity recorded mainly associated with rock fracturing within the volcanic edifice, located about 6 miles northwest of Arenas crater at depths between 5 and 9 km. The largest magnitude earthquake recorded so far since the beginning of this increased activity on April 13, April 16 occurred today at 07:14 with a magnitude of 3.2 ML (local magnitude). Six of the events of this increase has exceeded magnitude 2.5 ML and some of them have been reported felt by officers of the Los Nevados National Natural Park in the area of Brisas.Since last April 10 was brought volcanic tremor related to fluid dynamics in volcanic conduits as well as processes of emission and ash.They continue to experience significant flows of water vapor and sulfur dioxide (SO2) into the atmosphere, evidenced both in the equipment installed in the volcano, as satellite images available. In the morning there was the column of gases and steam, which reached a height of 1000 m above the volcano's summit and presented scattering direction to the southwest of the volcano, following the wind regime in the area.Continue registering variations in volcanic deformation.It is reiterated that the move to a higher level of activity is performed when the comprehensive diagnosis of all the volcanic monitoring parameters may suggest...

Re: The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !

[link to volcans.blogs-de-voyage.fr] Lascar (Chili)An overflight performed on April 9th allowed to observe fumarolian activity on the inner wall of the crater as well as at the bottom which could not be seen because of the plumes. Measurements with a thermal camera revealed an average temperature of 600°C which would account for the glow sometimes.observed at night above the volcano.

The latest observations, the seismic and deformation data show that activity is stable so that the alert level is kept at Yellow.

[link to volcans.blogs-de-voyage.fr] A Sicilian friend has just told me that from now on, it is advisable, before starting a visit to Mount Etna, to consult the Civil Defence website in order to know the level of danger. Note that the site is in Italian and it is necessary to know this language to understand what is written! [link to www.protezionecivile.gov.it]

[link to volcans.blogs-de-voyage.fr] Etna AVRIL 17, 2013 · 08:04This morning, the webcams reveal that minor strombolian activity occurred at the NSE Crater during the night. The next hours will tell us whether these are the signs of a new paroxysm.